Sound-increasing device.



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SOUND INCREASING DEVICE.

(Applcltion Mod Apr. 997, 1899.) (No Medal.)

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Unirse STATES- Prrrantr @erica HORACE LENOARD SHORT, .OF NEW MALDEN, ENGLAND.

SOUND-INCREASING DEVICE.

SPECIFICATION forming part of Letters Patent No. 677,476, dated July 2, 1901.

Application led April 29, 1899. Serial No. 715,075. (No model.)

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Be it known that I, HORACE VLnnonnn SHORT, a subject of the Queen of Great Britain, residing at Newr Malden, in the county of Surrey, England, have invented certain new and useful Improvements in Sound-Increasing Devices; and I do'hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

My invention relates to articulate messages or other sounds produced by the vibrations of diaphragms in telephones, telephonie instruments, or the like or produced by mechanical means by phonographic instruments; and it has for its object improvements in the method of reproducing and increasing the volume and audibility of such sounds, so that they can be much more readily heard than is ordinarily the case and canbe made audible at long distances. My improved means of so increasing the sounds obtained by instruments of the kind described or of the like kinds relate more particularly to improvements in the known devices more or less analogous to the relays ordinarly used in the transmission of electric-telegraph mes- In such devices the vibrating diaphragm of atelephone receiving instrument or the style or point which presses upon the cylinder (or disk) of a phonograph is made to cause or influence corre-y sponding vibrations or interruptions in a column or body of air, these interruptions being reproduced upon a largely-magniied scale from and by the-governing vibrations of the telephone-diaphragm or of the phonographic point, the sounds produced being directed in any desired direction by means of a trumpet-shaped or other apparatus, through which they are delivered and dispersed.

In the drawings, Figure l is a central sectional vieW of myinvention. Fig. 2 is a front view of part of Fig. 1. Fig. 3 is a detail view relating to Fig. l. Figs. 4 and 5 represent further detail views. Fig. 6 isa detail sectional view of a moditiedportion of Fig. 1. Fig. 7 is a similar view of a modification of Fig. 5.

In Fig. 1 the voice is used tc speak into a mouthpiece u and set in corresponding vidle fu, Which passes through the cap w, fittedV upon the end of the chamber d, of suitable diameter, into which air under sufficient pressure is forced through the pipe ct. Across the chamber a is a rigid diaphragm or partition no, having a series of parallel slits through it, forming a grating, as shown in front view in Fig. 2. To the partition o; is hinged at a plate consisting of a series of light tongues or strips y of such size as just to close the holes forming the grating in x. This plate of tonguesy is connected at y' Ato the spindle o, operated by the diaphragm g of the telephone when the latter is spoken to, and the vibrations of the diaphragm g are therefore transmitted to the tongues y, which open and more or less close the passages through the grating at a speed and in a manner exactly corresponding with the movements or vibrations of the diaphragm gV and cause corresponding undulations inthe column of air which is forced in at a' and is discharged through the trumpet-mouthed pipe e', the Words or other sounds uttered intothe telephone at u being reproduced, very greatly magnified and strengthened, and capable of being heard at a great distance by the more or less complete closing at very rapid intervals of the apertures or grating through which the' air is4 forced. This form of apparatus is especially adapted to be used Where the loud sounds to be produced are obtained by the undulations of the column of air forced through the valve, as shown. A spring m assistsv in bringing back the tongues.

In Fig. 6 the 'same apparatus is shown partly broken oft', but operated by movements of the style or point M of a phonograph upon a properly-indented cylinder N or disk.

Fig. 7 shows aregulating-screW P, by Which the pressure on the spindle'between the valve y and the phonograph-cylinder N can be exactly adjusted and regulated.

What I claim as my invention, and desire to secure by Letters Patent, is-

l. An apparatus forincreasing the sound for telephones, phonographs and a similar instrument having a part adapted to vibratev in accordance With sound-Waves comprising a valve for controlling the passage of a fluidcurrent, said valve consisting of a plate proforming a valve, and means for vibrating ro vided with slits and movable tonguesfor consaidvalve,v substantially as described. trolling said slits and a connection leading In testimony whereof I have hereunto affrom said valve to the said vibrating part, fxed'my signature in presence of two wit- :5 substantially as described. nesses.

2. In combination, the valve-box having HORACE LENOARD SHORT,

air inlet and discharge portionsla grating of Witnesses: parallel bars in said chamber forming a valve- ARTHUR E. EDWARDS, seat, a hinged grating of corresponding bars H. E. SYKES.' 

